Abstract: A 360 degree, in-phase audio propagation system utilizating sound propagation in conjunction with various types of active reflectors. In a first embodiment two bass speakers or woofers are mounted in an air-tight casing, the first speaker being mounted internal to the casing and facing outwardly through an aperture, the second speaker being mounted colinear with the first speaker. The casing is supported so that the first speaker is spaced from the floor facing downwardly whereby sound is reflected in a 360 degree pattern from the floor. The two speakers are driven out of phase with each other so that air within the chamber is alternately compressed and rarefied in accordance with a speaker driving signal, thereby preventing either speaker from resonating or overreacting to the driving signal. Sound from the front of the first speaker combines with and is reinforced by sound from the back of the second speaker thereby providing essentially a 360 degree propagation pattern.